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Excessive for what?

Judging from your profile and other threads I'd say it's too much unless you are eating about double of what you said in one post ( 1400)  you are young and growing the minimum for a teen female is 1600 cal.  If you are walking 3 hours at a good pace you will probably burn well over 1000 cal so you will need to eat about 3K calories on your walking days.

See a doctor to discuss exercise and nutrition

ok!!

I agree. Its good but you should be eating more as you know. I know you are working on it too though. Is this walking all at once or part of your vacay activities?

all at once 

A little much unless you get eating more :)